Severe Ragweed Allergies

My dog and I both have ragweed allergies. She nibbles on her knuckles until I give her diphenhydramine (generic benadryl) hidden in peanut butter. I hang in there until I need a mixture of half a diphenhydramine, generic excedrin, and decongestant. Oy! If I don't take the medicine I am doubled over in agony.